* {
	margin: 0px auto; 
	padding: 0px;
	}

#topo{
		margin: 0px auto; 
		width: 1200px; 
		height: 200px; 
		margin-top: 5px;
		background-color:#558CFF;
		}

#img_topo{
			width: 1200px ; 
			height: 200px;  
			margin: 0px auto; position:absolute;
			background-image:url(../img/logo_ca.png);
			
			position:absolute;
			}